Measurement device, measurement method, program and recording medium

Abstract

A measurement device according to the present disclosure includes a light source which emits at least one kind of measurement light belonging to a predetermined wavelength band toward a measurement region formed of at least part of a living body, a detection unit in which a plurality of sensors is regularly arranged in a predetermined arrangement and which detects the measurement light emitted from the light source and passing through the living body with the plurality of sensors, and an analysis unit which performs analysis processing of specifying a measurement position for measuring information on pulsation along with activities of the living body from the measurement region based on a temporal change in an amount of light of the detected measurement light by use of a detection result detected by the detection unit.

The invention claimed is: 
     
       1. A measurement device comprising:
 a light source to emit measurement light within a predetermined wavelength band, the light source being arrangeable to emit the measurement light toward a measurement region of a living body; 
 a detection apparatus to detect emitted measurement light, the detection apparatus being arrangeable to detect the emitted measurement light from the living body, the detection apparatus having (i) a micro lens array which includes a plurality of lenses arranged in a predetermined arrangement and which has a light incident side, (ii) a sensor device having one or more respective sensor pixels corresponding to each of a plurality of micro lenses in the micro lens array to measure an intensity of the emitted measurement light thereon, (iii) a first light shield provided on the light incident side of the micro lens array to control directivity of the emitted measurement light onto the light incident side of the micro lens array, and (iv) a second light shield and a diaphragm provided between a side of the micro lens array which is opposite to the light incident side thereof and the sensor device to control directivity of the emitted measurement light after passing through the micro lens array; and 
 a processing device to perform a predetermined process to specify a measurement position from the measurement region for measuring information on pulsation of the living body based respectively on a temporal change in an amount of light of the sensor pixels corresponding to each of a number of the lenses of the micro lens array as detected by the detection apparatus, 
 wherein the processing device during operation calculates a pulse waveform derived from arterial pulsation inside the living body corresponding to the measurement region. 
 
     
     
       2. The measurement device according to  claim 1 , wherein during operation the processing device specifies, as the measurement position, a position having maximum amplitude of the pulse waveform. 
     
     
       3. The measurement device according to  claim 1 , wherein during operation the processing device performs the predetermined process per wavelength of the measurement light emitted from the light source. 
     
     
       4. The measurement device according to  claim 1 , wherein during operation the processing device further calculates oxygen saturation in the arteries from the calculated pulse waveform. 
     
     
       5. The measurement device according to  claim 1 , wherein during operation the processing device corrects a phase in a temporal axis of detection results depending on an isolation distance between a position where the measurement light is detected and the light source. 
     
     
       6. The measurement device according to  claim 1 , wherein during operation the processing device integrates detection results at detection positions at same isolation distances from the light source. 
     
     
       7. The measurement device according to  claim 1 , wherein during operation the processing device corrects and combines times for detection results corresponding to the mutually different times. 
     
     
       8. A measurement method comprising:
 emitting, by a light source, measurement light within a predetermined wavelength band toward a measurement region of a living body; 
 detecting, by a detection apparatus, emitted measurement light from the living body, the detection apparatus having (i) a micro lens array which includes a plurality of lenses arranged in a predetermined arrangement and which has a light incident side, (ii) a sensor device having one or more respective sensor pixels corresponding to each of a plurality of micro lenses in the micro lens array to measure an intensity of the emitted measurement light thereon, (iii) a first light shield provided on the light incident side of the micro lens array to control directivity of the emitted measurement light onto the light incident side of the micro lens array, and (iv) a second light shield and a diaphragm provided between a side of the micro lens array which is opposite to the light incident side thereof and the sensor device to control directivity of the emitted measurement light after passing through the micro lens array; and 
 performing, by a processing device, a predetermined process to specify a measurement position from the measurement region for measuring information on pulsation of the living body based respectively on a temporal change in an amount of light of the sensor pixels corresponding to each of a number of the lenses of the micro lens array as detected by the detection apparatus, 
 wherein the processing device during operation calculates a pulse waveform derived from arterial pulsation inside the living body corresponding to the measurement region. 
 
     
     
       9. A non-transitory computer readable recording medium having stored thereon a program which when executed causes a computer communicable with a measurement device, the measurement device having (i) a light source to emit measurement light within a predetermined wavelength band in which the light source is arrangeable to emit the measurement light toward a measurement region of a living body and (ii) a detection apparatus to detect emitted measurement light in which the detection apparatus is arrangeable to detect the emitted measurement light from the living body, to:
 obtain a signal indicative of detected emitted measurement light from the detection apparatus; and 
 perform a predetermined process, based on the signal indicative of detected emitted measurement light, to specify a measurement position from the measurement region for measuring information on pulsation of the living body, 
 in which the detection apparatus includes (i) a micro lens array which includes a plurality of lenses arranged in a predetermined arrangement and which has a light incident side, (ii) a sensor device having one or more respective sensor pixels corresponding to each of a plurality of micro lenses in the micro lens array to measure an intensity of the emitted measurement light thereon, (iii) a first light shield provided on the light incident side of the micro lens array to control directivity of the emitted measurement light onto the light incident side of the micro lens array, and (iv) a second light shield and a diaphragm provided between a side of the micro lens array which is opposite to the light incident side thereof and the sensor device to control directivity of the emitted measurement light after passing through the micro lens array, and 
 in which performing of the predetermined process to specify the measurement position is based respectively on a temporal change in an amount of light of the sensor pixels corresponding to each of a number of the lenses of the micro lens array as detected by the detection apparatus, 
 wherein the predetermined process comprises calculating a pulse waveform derived from arterial pulsation inside the living body corresponding to the measurement region.